Summary:
Fixes T12960. When the user enters a date like "1917", we currently loop ~20 million times.
Instead:
- Be a little more careful about parsing.
- Javascript's default behavior of interpreting "2001-02-31" as "2001-03-03" ("February 31" -> "March 3") already seems reasonable, so just let it do that.
Test Plan:
Verified these behaviors:
- `2017-08-08` - Valid, recent.
- `17-08-08` - Valid, recent.
- `1917-08-08` - Valid, a century ago, no loop.
- `2017-02-31` - "February 31", interpreted as "March 3" by Javascsript, seems reasonable.
- `Quack` - Default, current time.
- `0/0/0`, `0/99/0` - Default, current time.
Reviewers: avivey, chad
Reviewed By: chad
Maniphest Tasks: T12960
Differential Revision: https://secure.phabricator.com/D18383
e89087fc51